Pile foundation construction method in continuous water pond environment

Abstract

The present application relates to the field of pile foundation engineering, and particularly relates to a pile foundation construction method in continuous pond environment, comprising the following steps: filling a main construction road along the longitudinal dike of one side of the continuous pond; taking the first pond body as the current pond body, carrying out pumping operation on the current pond body, and filling an operation platform in the current pond body through the main construction road; excavating a water passage on the transverse dike between the current pond body and the adjacent next level pond body, so that the water in the next level pond body can be discharged to the current pond body, and filling a corresponding operation platform in the next level pond body through the main construction road; taking the next level pond body as the current pond body, and repeating the previous step until the operation platforms corresponding to all the pond bodies are completed, and the pile foundation construction is completed. The present application can reduce the backfilling earthwork and pumping amount, thereby greatly saving the construction cost and construction period, and providing an efficient and economical solution for the pile foundation construction in continuous pond environment.

Description

Technical Field

[0001] This invention relates to the field of pile foundation engineering, and in particular to a pile foundation construction method in a continuous pond environment. Background Technology

[0002] In the actual construction process of road engineering, the proposed route may need to cross a series of ponds. A series of ponds refers to multiple ponds arranged continuously in a certain direction in space, and the proposed route needs to cross these ponds with its direction roughly consistent with the arrangement of the ponds. A series of ponds includes longitudinal and transverse embankments. The longitudinal embankments are aligned with the arrangement of the ponds, while the transverse embankments are perpendicular to the longitudinal embankments. Adjacent ponds are separated by transverse embankments. The bottom elevation of each pond increases or decreases sequentially along the arrangement of the series of ponds.

[0003] Before constructing the pile foundations for a planned railway line, the usual method is to completely drain the water from a pond, then backfill the entire pond area, and finally proceed with the pile foundation construction. However, this method requires backfilling the entire pond, resulting in an extremely large volume of backfill earthwork, high construction costs, and a long construction period. Therefore, it is necessary to develop a new solution suitable for continuous ponds. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of high construction costs and long construction periods in the existing technology of pile foundation construction for railway lines in a continuous pond environment, which requires complete dewatering and backfilling of the entire pond. Therefore, this invention provides a pile foundation construction method in a continuous pond environment.

[0005] In a second aspect, the present invention provides a pile foundation construction method in a continuous pond environment, comprising the following steps:

[0006] S1: Construct the main construction access road by filling in the longitudinal embankment along one side of the continuous pond; S2: Construction proceeds from the lowest end to the highest end of the continuous pond. The first pond body is used as the current pond body. Water is pumped out of the current pond body. When the water depth drops to the predetermined height, a working platform is constructed in the current pond body through the main construction access road. The position and size of the working platform are determined based on the two adjacent rows of pile foundations to be constructed along the extension direction of the line to be constructed. A mud pit is reserved when the working platform is constructed. The mud pit is located between the two adjacent rows of pile foundations to be constructed. S3: Excavate a water passage on the transverse embankment between the current pond and the adjacent next-level pond so that the water in the next-level pond can be discharged into the current pond. After the drainage is completed, block the water passage and fill the corresponding working platform in the next-level pond through the main construction access road. S4: Take the next level of pond as the current pond and repeat step S3 until all the working platforms corresponding to all ponds have been filled and the pile foundation construction is completed.

[0007] This invention provides a pile foundation construction method in a continuous pond environment. The main construction access road serves as a passage for machinery and materials during the filling of each work platform. Pumping or draining water from the pond lowers the water level, reducing the likelihood of water-bearing during filling. This helps reduce the water content of the work platforms after filling, enhancing their stability, reducing settlement and deformation, and providing a stable foundation for subsequent pile foundation construction. The work platforms are determined based on two adjacent rows of piles to be constructed along the planned route. This means that the filling area of ​​the work platforms only needs to accommodate the construction of the piles, eliminating the need to backfill the entire pond, significantly reducing the amount of backfill earthwork and saving construction costs. Simultaneously, the mud pit is located between two adjacent rows of piles, allowing them to share a single work platform and mud pit. This arrangement reduces the number of work platforms and mud pits, further lowering construction costs. A mud pit is reserved during the construction of the work platform. This solution avoids the need to excavate the mud pit again after the work platform is completed, reducing backfill volume and saving time and money associated with excavating the mud pit. A water passage is excavated on the transverse embankment between the current pond and the adjacent next-level pond, utilizing the elevation difference to allow water from the next-level pond to naturally drain into the current pond. This method eliminates the need for pumping operations in the next-level pond, saving pumping costs. Since the work platform has been completed in the current pond, it can be refilled. Blocking the water passage prevents water from flowing through it to the lower-level pond when the next-level pond is refilled, thus preventing the lowest-level pond from overflowing.

[0008] This invention provides a pile foundation construction method in a continuous pond environment. By filling only the working platform required for the construction of the pile foundation, and by utilizing the height difference between the ponds, water in the pond with a higher bottom elevation is drained into the adjacent pond with a lower bottom elevation. This reduces the amount of backfill and water pumping, thereby greatly saving construction costs and time. It provides an efficient and economical solution for pile foundation construction in a continuous pond environment.

[0009] The continuous pond consists of several ponds arranged in a straight line, with the bottom elevation of these ponds changing in an increasing or decreasing order. The bottom elevation of the next-level pond is higher than that of the current pond.

[0010] Preferably, in step S2, the size of the mud pit is determined based on the spacing between two adjacent rows of piles to be constructed, the working width required for constructing the piles to be constructed, the cross-sectional radius of the piles to be constructed, and the maximum design depth of the piles to be constructed.

[0011] Preferably, in step S2, the length of the mud pit is... l ,Width d ,high h Determine according to the following formula:

[0012]

[0013]

[0014] in, t This indicates the filling height of the work platform; j This indicates the spacing between two adjacent rows of pile foundations to be constructed along the direction of the planned route. k This indicates the working width required for constructing the pile foundation to be built; r This represents the cross-sectional radius of the pile foundation to be constructed; L This indicates the maximum design depth of the pile foundation to be constructed; η This indicates the magnification factor.

[0015] This scheme sets the amplification factor. η This is to account for the need to reserve a certain safety margin during construction to cope with possible unexpected situations, such as fluctuations in mud volume and deviations in construction operations, ensuring that the mud pit has sufficient capacity to meet construction needs. At the same time, since the mud pit will be sloped around its perimeter, the slope will occupy part of the mud pit's space; therefore, an amplification factor is introduced. η This factor can be considered in advance when calculating the dimensions, avoiding insufficient actual usable capacity of the mud pit. This solution can quickly determine the dimensions of the mud pit, ensuring that the final reserved mud pit size can meet the construction requirements of the pile foundation to be built, and guaranteeing the smooth progress of construction.

[0016] Preferably, when When less than 200m³, η The value ranges from 1.5 to 1.8. When the volume is greater than or equal to 200m³, η The value ranges from 1.2 to 1.4.

[0017] In this scheme, This represents the volume of a single pile foundation to be constructed. When the volume of a single pile foundation is less than 200 m³, the slope around the mud pit has a significant impact on the volume of the mud pit; therefore, the magnification factor is increased. ηThe magnification factor is set relatively large. However, when the volume of a single pile foundation to be constructed is greater than or equal to 200 m³, the slope around the mud pit has little impact on the volume of the mud pit; therefore, the magnification factor is set relatively large. η The specific magnification factor is set relatively small. η The selection of the amplification factor also needs to be based on the site geological conditions, construction process requirements, and the expected mud production. When the site geological conditions are complex, the construction process requirements are high, and the expected mud production is large, the amplification factor needs to be increased. η Take the larger value.

[0018] This scheme, by setting values ​​under the aforementioned different conditions, can ensure the amplification factor. η The value is within a reasonable range, thus effectively guiding the planning and design of mud pit capacity.

[0019] Preferably, in step S3, when the water in the next-level pond cannot be completely drained to the current pond, the remaining water in the next-level pond is pumped out, or an enlarged platform is built around the working platform corresponding to the next-level pond.

[0020] When the elevation difference between the bottom of the next-level pond and the bottom of the current pond is significant, all the water in the next-level pond can be drained into the current pond, thus requiring no additional measures. However, when the elevation difference between the bottom of the next-level pond and the current pond is small, or when the water level in the current pond has reached its maximum and there is still water remaining in the next-level pond, there is a possibility that not all the water in the next-level pond can be drained into the current pond. In this case, pumping can be used to remove the remaining water from the next-level pond; alternatively, an enlarged platform can be constructed around the work platform without pumping out the remaining water. The purpose of constructing the enlarged platform is to ensure the compaction of the work platform while it is being filled with water, thereby ensuring construction quality.

[0021] Preferably, the remaining water in the next-level pond is either pumped out or an enlarged platform is built around the working platform in the following manner:

[0022]

[0023] in, Y 1 represents the cost of pumping out the remaining water; Y 2 represents the cost of constructing the expanded platform; H Indicates the remaining water depth; S This indicates the area of ​​the next-level pond. p 1 represents the cost per cubic meter of water pumped; This indicates the width of the expanded platform; tThis indicates the filling height of the work platform; C This represents the outer perimeter of the work platform; p 2 indicates the cost per cubic meter of fill soil; when Y 1≤ Y At time 2, choose to pump out the remaining water; when Y 1> Y At time 2, the enlarged platform is constructed around the work platform.

[0024] Since both pumping out the remaining water and filling in to expand the platform would increase construction costs, this solution compares... Y 1 and Y A size of 2 allows for the selection of lower-cost solutions, thereby effectively saving construction costs.

[0025] Preferably, the materials used to fill the working platform and the expanded platform are both earthwork, and cement is added to the earthwork of the expanded platform, with the cement content being 3%-8% of the earthwork mass.

[0026] Since the expanded platform is located on the periphery of the working platform, it is susceptible to erosion by the water in the pond. Therefore, this solution incorporates cement into the earthwork of the expanded platform. After the cement hydration reaction, it can form an integral structure with a certain strength with the particles in the earthwork. This integral structure can reduce the erosive effect of water on the expanded platform and improve the stability of the expanded platform after the filling is completed.

[0027] The work platform can be constructed directly from the main construction access road, meaning that the completed work platform will be directly adjacent to the main construction access road. Alternatively, a secondary construction access road can be constructed first between the work platform and the main construction access road, and then the work platform can be constructed via the secondary construction access road.

[0028] Preferably, before filling the work platform, a secondary construction access road is constructed between the filling area of ​​the work platform and the main construction access road. This solution can further reduce the filling range of the work platform, effectively reduce the amount of backfill earthwork, thereby reducing construction costs and shortening the overall construction cycle. The secondary construction access road serves to connect the work platform and the main construction access road, allowing machinery and materials to reach the work platform from the main construction access road via the secondary construction access road.

[0029] The filling materials for the main construction access road and the secondary construction access road can be ordinary earthwork or quarry rock. Ordinary earthwork refers to soil material in its natural state without special processing, which may contain different proportions of clay, sand, gravel, etc. Quarry rock refers to a mixture of crushed stones formed from natural rocks obtained from the mountain through blasting, mechanical mining, or manual excavation.

[0030] Preferably, the material used for filling the main and secondary construction access roads is quarried rock. This is because the main and secondary construction access roads are used frequently during construction, and the frequent passage of vehicles and equipment places high demands on their load-bearing capacity. Compared to ordinary soil, quarried rock has better mechanical properties and stability. Using quarried rock for filling can significantly improve the load-bearing capacity of the main and secondary construction access roads, effectively reducing problems such as road surface damage and settlement caused by insufficient load-bearing capacity.

[0031] Preferably, after the secondary construction access road is filled, a temporary steel plate is laid at the connection between the main construction access road and the secondary construction access road.

[0032] Because the connection between the main and secondary access roads is located at a corner, transport vehicles cause significant ground disturbance when traveling in this area. Therefore, this solution involves laying temporary steel plates in this corner area. These temporary steel plates can distribute the load evenly, mitigating the concentrated load generated by transport vehicles traveling in the corner. This effectively reduces the localized pressure on the corner area, lowers the probability of damage, and prevents vehicles from getting stuck due to road damage, thus ensuring smooth and efficient construction and avoiding disruptions to overall construction efficiency caused by vehicles getting stuck.

[0033] Preferably, in step S3, instead of sealing the water passage after drainage is completed, the water passage is sealed when the water level in the current pond reaches its highest level in the current step or a subsequent step.

[0034] The purpose of this scheme is not limited to immediately sealing the water passage after draining water from two adjacent ponds to the same level. This approach may have a problem: the current pond may not actually have reached its maximum water level and still have the capacity to receive water from the next lower-level pond. Therefore, this scheme allows water from multiple consecutive ponds to be drained sequentially through the water passage until the lowest-level pond reaches its predetermined maximum water level before sealing the passage. This maximizes the use of gravity drainage, reduces pumping volume, and further saves costs.

[0035] Preferably, in step S3, before excavating the water passage, retaining walls are driven into the transverse embankments on both sides of the water passage. In this design, the retaining walls effectively protect the excavated surfaces on both sides of the water passage. During the use of the water passage after excavation, the water flow will scour the excavated surfaces, and the retaining walls can withstand the impact of the water flow, preventing the transverse embankments from continuously collapsing due to the continuous scouring, thereby ensuring the structural stability of the water passage.

[0036] Preferably, in step S3, after sealing the water passage, the retaining wall panel is removed. The removed retaining wall panel can be reused in subsequent water passages, saving construction costs.

[0037] Preferably, the method of sealing the water passage is to place a temporary sealing element on the side of the water passage facing the next-level pond, the temporary sealing element being able to cover the water passage, to fill the water passage with a permanent sealing element, and to remove the temporary sealing element after the permanent sealing element seals the water passage.

[0038] In this scheme, the temporary sealing component can effectively reduce the water flow through the water passage and reduce the impact of the water flow on the subsequent filling of the permanent sealing component, creating favorable conditions for the stable filling of the permanent sealing component and preventing the permanent sealing component from being washed away by the water flow.

[0039] The temporary sealing element can be a steel gate or a reinforced gabion. The permanent sealing element can be sandbags or earthwork.

[0040] The reinforced gabion consists of a steel cage and stones filling it. The steel cage acts as a skeleton, providing the necessary strength and stability for the entire structure. The stones fill the interior of the steel cage, giving it weight and erosion resistance. Sandbags are used to completely seal the water passage, thereby restoring the transverse embankment. Once the sandbags have sealed the water passage, the reinforced gabion can be removed. Because the removed reinforced gabion can be reused to seal the next water passage, construction costs are saved.

[0041] Preferably, before filling the work platform, a water pipe is placed between the mud pit and the outside of the work platform area in advance, so that after the pond is refilled with water, water can enter the mud pit through the water pipe. After the water depth in the mud pit reaches a predetermined height, the water pipe is blocked.

[0042] In this solution, the water injection into the pond can be completed simultaneously with the water injection into the mud pit, eliminating the need for a separate water injection operation into the mud pit and effectively saving time and costs. At the same time, sealing the water pipe can prevent the mud in the mud pit from flowing with the water in the pond when the mud pit is used later, preventing mud loss or dilution of the mud by the water in the pond.

[0043] Preferably, both ends of the water pipe are wrapped with geotextile. In this design, the geotextile can intercept and prevent mud, sand, debris, and other impurities from entering the interior of the water pipe, thus preventing the water pipe from becoming blocked.

[0044] The sealing method for the water pipe can be either to pile up soil at one end of the water pipe, or to connect a pipe above the water surface to the water pipe and inject sealing material into the water pipe through the pipe to seal the water pipe.

[0045] Preferably, a vertical pipe is connected to the water pipe, and the top of the vertical pipe is higher than the water level after the pond is refilled. The water pipe is sealed by injecting sealing material into the vertical pipe.

[0046] Compared with the method of blocking one end of the water pipe by piling up soil, this solution can quickly, conveniently and accurately achieve the blocking operation of the water pipe.

[0047] Preferably, when filling the work platform, a layered filling and compaction method is adopted, with each layer not exceeding 30cm in thickness and a compaction degree of at least 90%; in step S1, the width of the main construction access road is not less than 4.5m; in step S3, the excavation position of the water passage on the transverse embankment is close to the side of the main construction access road. This scheme sets the water passage close to the side of the main construction access road, which facilitates the excavation and subsequent sealing operations of the water passage through the main construction access road.

[0048] In a second aspect, the present invention provides a pile foundation construction system in a continuous pond environment, applied to the pile foundation construction method in a continuous pond environment described in the first aspect, comprising a continuous pond and a main construction access road, wherein the continuous pond comprises several pond bodies, and the main construction access road is arranged axially along a longitudinal embankment on one side of the continuous pond; a working platform is filled in the pond body, the working platform is connected to the main construction access road, a mud pit is provided in the working platform, and a water passage is provided on the transverse embankment between two adjacent pond bodies.

[0049] This invention provides a pile foundation construction system in a continuous pond environment. The main construction access road serves as a passageway for machinery and materials during the filling of each of the work platforms. The work platforms serve as construction platforms for the pile foundations of the line to be built. The mud pit receives and stores waste mud generated by the mud circulation system during pile foundation drilling, and also provides temporary storage space for mud recycling. The water passage drains water from the pond where the work platforms are to be filled to the pond where the work platforms have already been filled. This construction system, by filling the work platforms and using the water passage, can reduce the amount of backfill and water pumping, thereby significantly saving construction costs and time, providing an efficient and economical solution for pile foundation construction in continuous pond environments.

[0050] Preferably, the work platform is connected via a secondary construction access road. The secondary construction access road serves to connect the work platform with the main construction access road, allowing machinery and materials to reach the work platform from the main construction access road via the secondary construction access road.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a pile foundation construction method in a continuous pond environment. By filling only the working platform required for the construction of the pile foundation to be built, and by taking advantage of the height difference between the ponds, the water in the pond with a higher bottom elevation is drained into the adjacent pond with a lower bottom elevation. This reduces the amount of backfill soil and water pumping, thereby greatly saving construction costs and construction period, and providing an efficient and economical solution for pile foundation construction in a continuous pond environment. 2. This invention provides a pile foundation construction system in a continuous pond environment. By filling the working platform and the water passage, the amount of backfill soil and water pumping can be reduced, thereby greatly saving construction costs and construction period, and providing an efficient and economical solution for pile foundation construction in a continuous pond environment. Attached Figure Description

[0052] Figure 1 This is a plan view of a continuous pond.

[0053] Figure 2 This is a schematic diagram of the longitudinal section of a continuous pond.

[0054] Figure 3 This is a plan view of the continuous pond backfill area.

[0055] Figure 4 This is a plan view of the work platform.

[0056] Figure 5 A cross-sectional view to enlarge the platform's location.

[0057] Figure 6 This is a schematic diagram of the water pipe and the vertical pipe.

[0058] Marked in the image: 1- Continuous ponds, 101 - Pond body, 102 - Longitudinal pond embankment, 103 - Transverse pond embankment. 2-Lines to be built 201 - Track axis, 202 - Pile foundation to be built 3-Main construction access road, 4-Work platform, 401 - Expanding the Platform 5-Mud pit, 6-Secondary construction access roads 7-Water passage, 8-Water pipe, 9-Vertical pipe, 901-Function Funnel. Detailed Implementation

[0059] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0060] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0061] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0062] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0063] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0064] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0065] Example 1 like Figures 1 to 3 As shown, a pile foundation construction method in a continuous pond environment includes the following steps: S1: Construct the main construction access road 3 by filling in the longitudinal embankment 102 along one side of the continuous pond 1.

[0066] S2: Construction proceeds from the lowest end of the continuous pond 1 to the highest end. The first pond body 101 is taken as the current pond body 101, that is, the pond body 101 with the lowest bottom elevation is taken as the current pond body 101. Water is pumped out of the current pond body 101. When the water depth drops to the predetermined height, the working platform 4 is filled in the current pond body 101 through the main construction access road 3. The position and size of the working platform 4 are determined based on the two adjacent rows of pile foundations 202 to be built along the extension direction of the line to be built 2. A mud pit 5 is reserved when filling the working platform 4. The mud pit 5 is located between the two adjacent rows of pile foundations 202 to be built.

[0067] Specifically, a water pump is used to pump water from pond 101 into an external river. The top elevation of the completed working platform 4 is flush with the designed elevation of the top of the pile foundation 202. The slope of the edge of the working platform 4 can be between 1:1 and 1:2. Figure 1 and Figure 3 The layout of the proposed Line 2 is shown, specifically the direction in which line axis 201 extends.

[0068] S3: Excavate a water passage 7 on the transverse embankment 103 between the current pond body 101 and the adjacent next-level pond body 101 so that the water in the next-level pond body 101 can be discharged into the current pond body 101. After the drainage is completed, block the water passage 7 and fill the corresponding working platform 4 in the next-level pond body 101 through the main construction access road 3.

[0069] Specifically, an excavator can be used to excavate a water passage 7 on the transverse embankment 103. The bottom elevation of the water passage 7 is level with the bottom elevation of the next-level pond body 101.

[0070] When filling the work platform 4, the surface of the work platform 4 shall be leveled, and the flatness error shall not exceed ±50mm.

[0071] S4: Take the next level pond 101 as the current pond 101, and repeat step S3 until all the work platforms 4 corresponding to all ponds 101 are filled and the pile foundation construction is completed.

[0072] Specifically, the pile foundation construction adopts the bored cast-in-place pile process, in which the drilling process uses mud wall protection technology for hole formation.

[0073] In an optional implementation, in step S2, the size of the mud pit 5 can be determined based on the spacing between two adjacent rows of pile foundations 202 to be constructed, the working width required for constructing the pile foundations 202, the cross-sectional radius of the pile foundations 202 to be constructed, and the maximum design depth of the pile foundations 202 to be constructed.

[0074] In an optional implementation, in step S2, the length of the mud pit 5 is... l ,Width d ,highh It can be determined using the following formula:

[0075]

[0076]

[0077] in, t This indicates the filling height of work platform 4; j This indicates the spacing between two adjacent rows of pile foundations 202 to be constructed along the extension direction of the line to be constructed 2; k This indicates the working width required for the construction of pile foundation 202; r This indicates the cross-sectional radius of pile foundation 202 to be constructed; L This indicates the maximum design depth of pile foundation 202 to be constructed; η This indicates the magnification factor.

[0078] Taking actual engineering cases as examples, such as Figure 4 As shown, the filling height of work platform 4 t =2.5m, the spacing between two adjacent rows of pile foundations to be constructed 202 j =30m, the required working width for constructing pile foundation 202. k =12m, the cross-sectional radius of the pile foundation to be constructed, 202. r =0.9m, the maximum design depth of pile foundation 202 to be constructed L =57m, magnification factor η Take 1.5.

[0079]

[0080]

[0081]

[0082] Calculations show that mud pit 5 is 14.50m long, 6m wide, and 4m high.

[0083] In an optional implementation, when When less than 200m³, η The value can range from 1.5 to 1.8, specifically 1.5, 1.6, 1.7, and 1.8. When When the volume is greater than or equal to 200m³, η The value can be between 1.2 and 1.4, and the specific values ​​can be 1.2, 1.3, and 1.4.

[0084] In an optional implementation, in step S3, if the water in the next-level pond 101 cannot be completely drained to the current pond 101, the remaining water in the next-level pond 101 can be pumped out, or an enlarged platform 401 can be built around the working platform 4 corresponding to the next-level pond 101.

[0085] In an optional implementation, the remaining water in the next-level pond 101 can be pumped out or an enlarged platform 401 can be constructed around the working platform 4 in the following manner:

[0086]

[0087] in, Y 1 represents the cost of pumping out the remaining water; Y 2 represents the cost of filling and expanding platform 401; H Indicates the remaining water depth; S This indicates the area of ​​the next-level pond body 101; p 1 represents the cost per cubic meter of water pumped; This indicates that the width of platform 401 has been increased; t This indicates the filling height of work platform 4; C This indicates the outer perimeter of work platform 4; p 2 indicates the cost per cubic meter of fill soil; when Y 1≤ Y At time 2, choose to pump out the remaining water; when Y 1> Y At time 2, an enlarged platform 401 was constructed around the work platform 4.

[0088] Taking actual engineering cases as examples, such as Figure 4 and Figure 5 As shown, the remaining water depth in the next-level pond 101 H =1m; Filling height of work platform 4 t =2.5m; the next-level pond 101 has a length and width of 110m, therefore the area of ​​the next-level pond 101 = 12100㎡; the width of the expanded platform 401 =2m; the length and width of the work platform 4 are 36m and 24m respectively, therefore the outer perimeter of the work platform 4 is 2m. C =120m; Cost per cubic meter of pumped water p 1 = 1.87 yuan / cubic meter; cost per cubic meter of fill. p 2 = 34.57 yuan / cubic meter.

[0089]

[0090]

[0091] It can be seen from the comparison At this point, choosing the option of filling and expanding platform 401 around working platform 4 is more cost-effective.

[0092] In the above case, if the remaining water depth in the next-level pond 101 is... H =0.8m, then:

[0093] It can be seen from the comparison In this case, choosing to pump out the remaining water is more cost-effective.

[0094] In an optional embodiment, both the filling platform 4 and the enlarged platform 401 can be made of earth. Cement can be added to the earth in the enlarged platform 401, with a cement content of 3%-8% of the earth mass, specifically 3%, 5%, 6%, 7%, or 8%. A certain proportion of fly ash can also be added to the earth, with a fly ash content of 5%-10% of the earth mass, to improve the earth's properties together with the cement. When adding cement to the earth, the cement is first pre-mixed with a portion of the earth, and then the pre-mixed mixture is thoroughly stirred with the remaining earth before being used to fill the enlarged platform 401.

[0095] The construction sequence of the working platform 4 and the enlarged platform 401 is as follows: first, the working platform 4 is filled in, and then the enlarged platform 401 is filled in around the working platform 4.

[0096] In an optional implementation, before filling the work platform 4, a secondary construction access road 6 can be filled between the filling area of ​​the work platform 4 and the main construction access road 3.

[0097] Specifically, the axis of the secondary construction access road 6 is perpendicular to the axis of the main construction access road 3. The working platform 4 can have two secondary construction access roads 6. The working platform 4 extends outwards by 3-5 meters in both the horizontal and vertical directions, based on the area where two adjacent rows of pile foundations 202 are located. During the filling of the main construction access road 3 and the secondary construction access road 6, a vibratory roller is used for compaction, and the vibration frequency and compaction speed are adjusted according to different fill thicknesses and material properties.

[0098] In an optional embodiment, the material used to fill both the main construction access road 3 and the secondary construction access road 6 can be quarry rock. Specifically, the particle size of the quarry rock ranges from 40mm to 100mm.

[0099] In an optional embodiment, after the secondary access road 6 is filled, a temporary steel plate is laid at the connection between the main access road 3 and the secondary access road 6. The thickness of the temporary steel plate can be 20mm-30mm. To enhance the driving safety of transport vehicles, anti-slip steel bars are welded to the top surface of the temporary steel plate, which effectively prevents vehicles from slipping by increasing the friction between the tires and the steel plate.

[0100] In an optional implementation, in step S3, blocking the water passage 7 after drainage is completed can be replaced by blocking the water passage 7 when the water level in the current pond 101 reaches the highest water level in the current step or a subsequent step.

[0101] Specifically, there are two situations in which the water passage 7 will not be blocked temporarily: one is when the water in the next-level pond 101 is discharged into the current pond 101, causing the water levels of the two ponds 101 to be equal, and the water level of the current pond 101 has not yet reached its maximum level; the other is when all the water in the next-level pond 101 has been discharged into the current pond 101, and the water level of the current pond 101 has not yet reached its maximum level.

[0102] In both of the above scenarios, the water passage 7 between the next-level pond 101 and the current pond 101 will not be blocked temporarily. In this way, when water from the next-next-level pond 101 is discharged to the next-next-level pond 101, the water can flow sequentially from the next-next-level pond 101 to the current pond 101. The water passage 7 will be blocked only when the water level in the current pond 101 reaches its maximum. If the water level in the current pond 101 has not yet reached its maximum, it may be considered to continue increasing the number of pond stages.

[0103] In an optional implementation, in step S3, before excavating the water passage 7, retaining plates can be driven into the transverse embankments 103 on both sides of the water passage 7.

[0104] Specifically, the wall panel has a thickness of 8mm-16mm, and a vibratory hammer is used to drive the wall panel vertically downward into the transverse embankment 103.

[0105] In an optional implementation, in step S3, after sealing the water passage 7, the retaining plate can be removed. The retaining plate can specifically be made of steel plate.

[0106] In an optional embodiment, the water passage 7 can be blocked by placing a temporary blocking component on the side of the water passage 7 facing the next-level pond 101, the temporary blocking component being able to cover the water passage 7, filling the water passage 7 with a permanent blocking component, and removing the temporary blocking component after the permanent blocking component blocks the water passage 7.

[0107] Specifically, the temporary sealing component can be a reinforced gabion, which consists of a steel reinforcement cage and stones filled within it. The mesh diameter of the steel reinforcement cage can be 100mm-200mm, and the stone size can be 150mm-300mm. The reinforced gabion can be placed or removed using a crane or excavator.

[0108] The permanent sealing component can be sandbags, which are made of high-strength waterproof canvas and filled with fine sand. The size of the sandbags is determined according to the width of the transverse embankment 103 cross-section. When filling the sandbags, a staggered stacking method is used, filling them layer by layer from bottom to top, and each layer of sandbags is tightly fitted together to enhance the sealing effect.

[0109] In an optional implementation, before filling the work platform 4, a water pipe 8 can be placed between the mud pit 5 and the outside of the work platform 4 area in advance, so that after the pond body 101 is refilled with water, water can enter the mud pit 5 through the water pipe 8. After the water depth of the mud pit 5 reaches the predetermined height, the water pipe 8 is blocked.

[0110] Specifically, the water pipe 8 can be a PVC pipe or corrugated steel with a diameter of 100mm-300mm. The water pipe 8 can be sealed by using an excavator to fill a bucket of earth at one end of the water pipe 8.

[0111] In an optional embodiment, both ends of the water pipe 8 may be wrapped with geotextile. Specifically, the geotextile is fixed to both ends of the water pipe 8 by binding straps. The geotextile can be of type 200g / m²-400g / m².

[0112] In optional implementations, such as Figure 6 As shown, a vertical pipe 9 can be connected to the water pipe 8. The top of the vertical pipe 9 is higher than the water level after the pond body 101 is refilled. The water pipe 8 is sealed by pouring sealing material into the vertical pipe 9. Specifically, the vertical pipe 9 and the water pipe 8 are made of the same material. The vertical pipe 9 can also be located in the area of ​​the working platform 4, and the top of the vertical pipe 9 needs to be higher than the top surface of the working platform 4. A funnel 901 can be provided at the top of the vertical pipe 9 to facilitate the pouring of sealing material into the vertical pipe 9. The sealing material can be concrete or earth. Concrete is preferred because it has high strength and stability after solidification, can form a reliable sealing structure, and has a better sealing effect.

[0113] In an optional implementation, when filling the work platform 4, a layered filling and compaction method can be adopted, with each layer not exceeding 30cm in thickness and a compaction degree of at least 90%; in step S1, the width of the main construction access road 3 is not less than 4.5m, and the specific width can be 4.5m, 5m, 5.5m, or 6m; in step S3, the excavation position of the water passage 7 on the transverse pond embankment 103 can be close to the side of the main construction access road 3.

[0114] Specifically, the distance between the water passage 7 and the main construction access road 3 can be 1m-3m.

[0115] Example 2 like Figures 1 to 3 As shown, a pile foundation construction system in a continuous pond environment is applied to the pile foundation construction method in a continuous pond environment described in Example 1. It includes a continuous pond 1 and a main construction access road 3. The continuous pond 1 includes several pond bodies 101. The main construction access road 3 is arranged axially along the longitudinal embankment 102 on one side of the continuous pond 1. A working platform 4 is filled in the pond body 101. The working platform 4 is connected to the main construction access road 3. A mud pool 5 is provided in the working platform 4. A water passage 7 is provided on the transverse embankment 103 between two adjacent pond bodies 101.

[0116] In an optional implementation, the work platform 4 can be connected via a secondary construction access road 6.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for pile foundation construction in a continuous pond environment, characterized in that, Includes the following steps: S1: Construct the main construction access road (3) by filling in the longitudinal embankment (102) on one side of the continuous pond (1); S2: Construction is carried out from the lowest end to the highest end of the continuous pond (1). The first pond body (101) is used as the current pond body (101). The current pond body (101) is pumped out. When the water depth drops to the predetermined height, the working platform (4) is filled in the current pond body (101) through the main construction access road (3). The position and size of the working platform (4) are determined based on the two adjacent rows of pile foundations (202) to be built along the extension direction of the line to be built (2). When filling the working platform (4), a mud pit (5) is reserved. The mud pit (5) is located between the two adjacent rows of pile foundations (202). S3: Excavate a water passage (7) on the transverse embankment (103) between the current pond body (101) and the adjacent next-level pond body (101) so that the water in the next-level pond body (101) can be discharged into the current pond body (101). After the drainage is completed, block the water passage (7) and fill the corresponding working platform (4) in the next-level pond body (101) through the main construction access road (3). S4: Take the next level pond (101) as the current pond (101), repeat step S3 until all the working platforms (4) corresponding to all ponds (101) are filled and the pile foundation construction is completed; In step S2, the size of the mud pit (5) is determined based on the spacing between two adjacent rows of pile foundations (202), the working width required for constructing the pile foundations (202), the cross-sectional radius of the pile foundations (202), and the maximum design depth of the pile foundations (202). In step S2, the length of the mud pit (5) l ,Width d ,high h Determine according to the following formula: in, t This indicates the filling height of the work platform (4); j This indicates the spacing between two adjacent rows of pile foundations (202) to be constructed along the extension direction of the line to be constructed (2); k This indicates the working width required for constructing the pile foundation (202) to be built; r This represents the cross-sectional radius of the pile foundation (202) to be constructed; L This indicates the maximum design depth of the pile foundation (202) to be constructed; η Indicates the magnification factor; when When less than 200m³, η The value ranges from 1.5 to 1.

8. When the volume is greater than or equal to 200m³, η The value ranges from 1.2 to 1.4; In step S3, when the water in the next-level pond (101) cannot be completely drained to the current pond (101), the remaining water in the next-level pond (101) is pumped out, or an enlarged platform (401) is built around the working platform (4) corresponding to the next-level pond (101). The remaining water in the next-level pond (101) may be pumped out or an enlarged platform (401) may be constructed around the working platform (4) in the following manner: in, Y 1 represents the cost of pumping out the remaining water; Y 2 represents the cost of filling the enlarged platform (401); H Indicates the remaining water depth; S This represents the area of ​​the next-level pond (101); p 1 represents the cost per cubic meter of water pumped; This indicates the width of the expanded platform (401); t This indicates the filling height of the work platform (4); C This represents the outer perimeter of the work platform (4); p 2 indicates the cost per cubic meter of fill soil; when Y 1≤ Y At time 2, choose to pump out the remaining water; when Y 1> Y At time 2, the enlarged platform (401) is constructed around the working platform (4). In step S3, before excavating the water passage (7), retaining plates are driven into the transverse embankments (103) on both sides of the water passage (7); In step S3, after sealing the water passage (7), the protective wall plate is removed; The method of sealing the water passage (7) is to place a temporary sealing element on the side of the water passage (7) facing the next level pond (101), the temporary sealing element being able to cover the water passage (7), filling the water passage (7) with a permanent sealing element, and removing the temporary sealing element after the permanent sealing element seals the water passage (7).

2. The pile foundation construction method in a continuous pond environment according to claim 1, characterized in that, The materials used to fill the working platform (4) and the enlarged platform (401) are both earthwork. Cement is added to the earthwork of the enlarged platform (401), and the amount of cement is 3%-8% of the mass of the earthwork.

3. The pile foundation construction method in a continuous pond environment according to claim 1, characterized in that, Before filling the work platform (4), a secondary construction access road (6) is filled between the filling area of ​​the work platform (4) and the main construction access road (3).

4. The pile foundation construction method in a continuous pond environment according to claim 3, characterized in that, The materials used to fill the main construction access road (3) and the secondary construction access road (6) are both quarry stone.

5. The pile foundation construction method in a continuous pond environment according to claim 3, characterized in that, After the secondary construction access road (6) is filled, a temporary steel plate is laid at the connection between the main construction access road (3) and the secondary construction access road (6).

6. A pile foundation construction method in a continuous pond environment according to any one of claims 1-5, characterized in that, In step S3, instead of sealing the water passage (7) after drainage is completed, the water passage (7) is sealed when the water level in the current pond (101) reaches the highest water level in the current step or a subsequent step.

7. The pile foundation construction method in a continuous pond environment according to claim 6, characterized in that, Before filling the work platform (4), a water pipe (8) is placed between the mud pit (5) and the outside of the work platform (4) area so that after the pond (101) is refilled with water, water can enter the mud pit (5) through the water pipe (8). After the water depth in the mud pit (5) reaches the predetermined height, the water pipe (8) is blocked.

8. The pile foundation construction method in a continuous pond environment according to claim 7, characterized in that, Both ends of the water pipe (8) are wrapped with geotextile.

9. The pile foundation construction method in a continuous pond environment according to claim 8, characterized in that, The water pipe (8) is connected to a vertical pipe (9). The top of the vertical pipe (9) is higher than the water level of the pond (101) after it has been refilled with water. The water pipe (8) is sealed by injecting sealing material into the vertical pipe (9).

10. A pile foundation construction method in a continuous pond environment according to claim 6, characterized in that, When filling the work platform (4), a layered filling and layered compaction method is adopted, with each layer not exceeding 30cm in thickness and a compaction degree of at least 90%; in step S1, the width of the main construction access road (3) is not less than 4.5m; in step S3, the water passage (7) is excavated on the transverse embankment (103) on the side close to the main construction access road (3).

11. A pile foundation construction system for a continuous pond environment, applied to the pile foundation construction method for a continuous pond environment as described in any one of claims 1-10, characterized in that, It includes a continuous pond (1) and a main construction access road (3). The continuous pond (1) includes several pond bodies (101). The main construction access road (3) is arranged along the axial direction of the longitudinal embankment (102) on one side of the continuous pond (1). A working platform (4) is filled in the pond body (101). The working platform (4) is connected to the main construction access road (3). A mud pit (5) is provided in the working platform (4). A water passage (7) is provided on the transverse embankment (103) between two adjacent pond bodies (101).

12. The pile foundation construction system in a continuous pond environment according to claim 11, characterized in that, The work platform (4) is connected via a secondary construction access road (6).

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